Superior part of shoe (5)
I believe the answer is:
upper
I believe this is a double definition.
'superior' is the first definition.
(eg an upper house in a parliament)
'part of shoe' is the second definition.
(I know that upper is part of shoe)
(Other definitions for upper that I've seen before include "Higher; superior" , "The higher of two, berths perhaps" , "Higher in position; drug" , "Higher in status" , "Stimulant drug (informal)" .)